Subject Identification, Recruitment And Consent: Subjects will be identified by a unique identification number analogous to that used by the Knoxville Orthopaedic Clinic. Subjects will be called by either Dr Edwin E Spencer Jr MD (PI) or his assistant Jeff Jarnagin PA and asked to be involved or participate. The patients will be made aware that participation in the study is completely voluntary and that participation does not affect their future access to care by Dr Spencer. Informed consent will be reviewed over the phone and in person when they come in for Xrays by Dr Spencer or his assistant Jeff Jarnagin PA. Attached is our consent form. Once the subject has completed the xray evaluation and completed the clinical forms, they will be paid the $50 stipend. The subject will incur no cost for participation in the study. Insurance carriers will not be billed for any part of the study. The money for the patients will come from the study sponsor DePuy Inc. The xrays including the floroscopy and radiologists' readings will be paid for by the study sponsor DePuy. The surgeon, Dr Spencer, will not be paid for his time and effort and is donating his time to science and the greater good.